When comparing quantities that change over time, you usually compute the difference in values according to: N e w v a l u e minus O l d v a l u e If the average price of a gallon of gasoline in 2020 was $2.19 and the average price in 2022 was $3.98, one might compare these two prices by computing $3.98 - $2.19 = $1.79. Since this number is positive, you can say that the average price of gasoline has increased $1.79 in two years, which is an annual change of 89.5 cents ($1.79 divided by two years). If the average price for a loaf of bread was $3.90 in 2020 and $3.50 in 2022, then the change in this basic item of food would be -$0.40. The negative sign tells us that the price of bread has decreased over this two-year period. (5) How much did the average price of a loaf of bread decreased by per year